A use-after-free flaw was found in cgroup1_parse_param in kernel/cgroup/cgroup-v1.c in the Linux kernel's cgroup v1 parser. A local attacker with a user privilege could cause a privilege escalation by exploiting the fsconfig syscall parameter leading to a container breakout and a denial of service on the system.
CVE-2021-4154 - High Severity Vulnerability
Vulnerable Library - linuxlinux-4.19.238
The Linux Kernel
Library home page: https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/?wsslib=linux
Found in HEAD commit: 05c0743befb9102e2ecb9fbd0fa8eb43eb8bb5ec
Found in base branch: master
Vulnerable Source Files (2)
/kernel/cgroup/cgroup-v1.c /kernel/cgroup/cgroup-v1.c
Vulnerability Details
A use-after-free flaw was found in cgroup1_parse_param in kernel/cgroup/cgroup-v1.c in the Linux kernel's cgroup v1 parser. A local attacker with a user privilege could cause a privilege escalation by exploiting the fsconfig syscall parameter leading to a container breakout and a denial of service on the system.
Publish Date: 2022-02-04
URL: CVE-2021-4154
CVSS 3 Score Details (8.8)
Base Score Metrics: - Exploitability Metrics: - Attack Vector: Local - Attack Complexity: Low - Privileges Required: Low - User Interaction: None - Scope: Changed - Impact Metrics: - Confidentiality Impact: High - Integrity Impact: High - Availability Impact: High
For more information on CVSS3 Scores, click here.Suggested Fix
Type: Upgrade version
Origin: https://www.linuxkernelcves.com/cves/CVE-2021-4154
Release Date: 2022-02-04
Fix Resolution: v5.4.134,v5.10.52,v5.12.19,v5.13.4,v5.14-rc2
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